8744478749 has 4 divisors (see below), whose sum is σ = 8788867164. Its totient is φ = 8700090336.

The previous prime is 8744478727. The next prime is 8744478761. The reversal of 8744478749 is 9478744478.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7641906724 + 1102572025 = 87418^2 + 33205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8744478749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8744478691 and 8744478700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8744478709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22193912 + ... + 22194305.

It is an arithmetic number, because the mean of its divisors is an integer number (2197216791).

Almost surely, 2^8744478749 is an apocalyptic number.

It is an amenable number.

8744478749 is a deficient number, since it is larger than the sum of its proper divisors (44388415).

8744478749 is a wasteful number, since it uses less digits than its factorization.

8744478749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44388414.

The product of its digits is 50577408, while the sum is 62.

The square root of 8744478749 is about 93511.9176843251. The cubic root of 8744478749 is about 2060.2091367934.

The spelling of 8744478749 in words is "eight billion, seven hundred forty-four million, four hundred seventy-eight thousand, seven hundred forty-nine".